Volume No. 3 Issue No.: 2 Page No.: 523-530 Oct-Dec 2008

 

CHARECTERIZATION OF URBAN STORM WATER RUNOFF

 

P.E. Zope* and P. H. Sawant

Department of Civil with Environment, S.P.C.E, Andheri, Mumbai (INDIA)

 

Received on : June 25, 2008

 

ABSTRACT

 

Runoff volumes and pollution loads increase considerably when a catchment is urbanized. Storm water runoff from urban surfaces often contains elevated levels of toxic pollutants when discharged directly into water bodies. These pollutants degrade water quality and impact aquatic life and human health and have potential for carcinogenic, mutagenic and allergetic effects.

The area selected for the case study was Milan subway at western suburb of Mumbai which is the chronic flooding spot for so many years. Increased quantity of runoff has increased the pollutant impact risk in the vicinity of the area.

This paper presents the analysis of the pollutants in the surface runoff, estimation of the pollutant loads to find out the pollutant impact and thereby attempting to provide the basic data to establish a proper treatment processes and best management practices to reduce the pollutant impact at the catchment area of the Milan subway, Mumbai. As per the analysis of storm water samples from site, the average event mean concentrations (EMCs) of DO, BOD, TSS, COD, O and G, chlorides, and TDS were 3.89 mg/ L, 18.33 mg/ L, 312.67 mg/ L, 59.67 mg/ L, 5.85 mg/ L, 34.37 mg/ L, and 245.5 mg/ L respectively. Also the unit pollutant loading rates of DO, BOD, TSS, COD, O and G, chlorides, and TDS were 78.71, 370.87, 6326.28, 1207.31, 118.36, 695.41 and 4967.22 kg/ha/yr respectively. The concentration of the total suspended solids is more than the permissible standard limits and requires controlling the source of suspended solids at their source only. The Best Management Practices are proposed to control the suspended solids at source only.

 

Keywords : Runoff, Pollution load, Best management practices, Pollutant impact, Non point sources, Unit pollutant loading rate.

 

 

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